Double-cylinder engine crankshaft with small vibration

Abstract

The small-vibration double-cylinder engine crankshaft comprises a main journal and a crank, the middle of one end of the crank is connected and fixed through a connecting rod journal, the main journal and a central journal are inserted into the outer sides of the two ends of the crank through connecting seats, weight increasing swing blocks are arranged on the two sides of the crank, and locking rods are inserted into the lower ends of the weight increasing swing blocks in a sliding mode. The weight increasing swing blocks are arranged on the two sides of the crank, the weight increasing swing blocks are perpendicularly welded to the outer wall of the crank, the balance weight on the two sides of the crank is increased, and the swing stability of the crank during work can be improved; and meanwhile, a locking rod is slidably inserted into the lower end of the weight increasing swing block, so that the main journal and the central journal which are mounted in one end of the connecting seat can be longitudinally inserted and positioned, the stability of mounting and fixing of the main journal and the central journal with the connecting seat is improved, and unstable vibration of the connecting structure is reduced conveniently.

Description

Technical Field

[0001] The utility model relates to the technical field of crankshafts, in particular to a double-cylinder engine crankshaft with small vibration. Background Art

[0002] The crankshaft is the most important part of the engine. It bears the force from the connecting rod and converts it into torque, which is output through the crankshaft and drives other accessories on the engine. The crankshaft is subjected to the combined effects of the centrifugal force of the rotating mass, the periodically changing gas inertia force and the reciprocating inertia force, which makes the crankshaft subject to bending and torsion loads. Therefore, the crankshaft is required to have sufficient strength and rigidity, and the journal surface must be wear-resistant, work evenly and have good balance.

[0003] The prior art discloses a twin-cylinder split crankshaft for an outboard motor with application number 202320804163.X, wherein the crankshaft main body assembly comprises a main journal and a gear connected to the right side wall of the main journal; a connecting assembly, wherein the connecting assembly structures cooperate with each other through the crankshaft main body assembly structure, so that the split crankshaft can be quickly installed and removed during use, thereby reducing the work pressure of maintenance personnel, and the crankshaft can be continuously lubricated to reduce friction, thereby increasing the service life of the crankshaft during daily use and simplifying the difficulty of installing and removing the split crankshaft. However, the stability of the installation and fixing of the main journal and the connecting seat on the outside of the crank is general, and vibration is easily generated when the connecting structure is unstable, and it is inconvenient to install and use the split crankshaft. Utility Model Content

[0004] The utility model aims to provide a twin-cylinder crankshaft with low vibration, so as to solve the problems in the prior art that the center journal and the connecting seat outside the crank are generally stable in installation and fixation, vibration is easily generated when the connecting structure is unstable, and it is inconvenient to disassemble and use.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a twin-cylinder engine crankshaft with low vibration, comprising a main journal and a crank, wherein the middle part of one end of the crank is connected and fixed by a connecting rod journal, and the main journal and the center journal are inserted into the outer sides of the two ends of the crank through connecting seats, and weighted pendulum blocks are provided on both sides of the crank, and a locking rod is slidably inserted into the lower end of the weighted pendulum block, and one end of the main journal and the center journal is provided with a locking groove that cooperates with the locking rod.

[0006] Furthermore, the weight-added pendulum block is vertically welded to the outer wall of the crank, and a through hole is provided on the inner side of the weight-added pendulum block.

[0007] Furthermore, the weight-added pendulum block is a rectangular block, and the longitudinal cross-section of the side wall of the weight-added pendulum block can be an isosceles trapezoid.

[0008] Furthermore, a limiting slide groove is provided inside the lower side of the weight-increasing pendulum block, and one end of the locking rod is slidably arranged in the limiting slide groove through a limiting support rod.

[0009] Furthermore, the limiting support rod is vertically welded to one end of the locking rod, and the limiting support rod slides through the side wall of the limiting sliding groove and is fixed by a gasket and a locking nut.

[0010] Furthermore, the limiting slide groove is arranged in a rectangular slide groove, and the width of the limiting slide groove is greater than the diameter of the limiting support rod.

[0011] Compared with the prior art, the beneficial effects of the utility model are:

[0012] 1. The utility model provides weighted pendulum blocks on both sides of the crank, which are vertically welded to the outer wall of the crank. The weighted pendulum blocks are rectangular blocks, and the longitudinal section of the side walls of the weighted pendulum blocks can be an isosceles trapezoid, thereby increasing the counterweights on both sides of the crank, which is beneficial to improving the stability of the crank's swing when it is working.

[0013] 2. The utility model has a locking rod inserted by sliding inside the lower end of the weighted pendulum block, and one end of the main shaft neck and the center shaft neck is provided with a locking groove matched with the locking rod, so that the main shaft neck and the center shaft neck installed inside one end of the connecting seat can be longitudinally inserted and positioned, which is beneficial to improve the stability of the installation and fixation of the main shaft neck and the center shaft neck to the connecting seat, and is convenient to reduce the generation of vibration when the connecting structure is unstable, and the locking rod is convenient and quick to disassemble and assemble.

[0014] 3. The utility model vertically welds a limiting support rod to one end of the locking rod, and the limiting support rod slides through the side wall of the limiting slide groove and is fixed by a gasket and a locking nut, so that the end of the locking rod inserted into the locking groove can be locked, which is convenient for improving the stability of the locking rod end inserted in the locking groove. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0016] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0017] Figure 2 This is the overall structural front view of the utility model;

[0018] Figure 3 It is a schematic diagram of the structure of the weight-increasing pendulum block of the utility model.

[0019] In the figure: 1. main journal; 2. crank; 3. connecting seat; 4. connecting rod journal; 5. center journal; 6. weight-increasing pendulum block; 7. locking rod; 8. limiting slide groove; 9. gasket; 10. locking nut; 11. limiting support rod; 12. locking groove; 13. through hole. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0021] See also Figure 1 , Figure 2 , Figure 3 In the embodiment of the utility model, a twin-cylinder crankshaft with low vibration includes a main journal 1 and a crank 2. The middle part of one end of the crank 2 is connected and fixed by a connecting rod journal 4. The main journal 1 and the center journal 5 are inserted into the outer sides of the two ends of the crank 2 through a connecting seat 3. Weighted pendulum blocks 6 are provided on both sides of the crank 2. The weighted pendulum blocks 6 are vertically welded to the outer wall of the crank 2, and a through hole 13 is clamped on the inner side of the weighted pendulum blocks 6. The weighted pendulum blocks 6 are rectangular blocks, and the longitudinal section of the side walls of the weighted pendulum blocks 6 can be an isosceles trapezoid, so that the counterweights on both sides of the crank 2 are increased, which is beneficial to improving the stability of the swing of the crank 2 when working.

[0022] like Figure 1 and Figure 3 As shown, in order to improve the stability of the installation and fixation of the main shaft neck 1 and the center shaft neck 5 and the connecting seat 3, a locking rod 7 is also slidably inserted inside the lower end of the weight-increasing pendulum block 6, and one end of the main shaft neck 1 and the center shaft neck 5 is provided with a locking groove 12 which cooperates with the insertion of the locking rod 7, and a limiting slide groove 8 is opened inside the lower side of the weight-increasing pendulum block 6, and one end of the locking rod 7 is slidably set with the limiting slide groove 8 through a limiting support rod 11, so that the main shaft neck 1 and the center shaft neck 5 installed inside one end of the connecting seat 3 can be longitudinally inserted and positioned, which is beneficial to improving the stability of the installation and fixation of the main shaft neck 1 and the center shaft neck 5 and the connecting seat 3, and is convenient for reducing the generation of vibration when the connection structure between the shaft neck and the connecting seat 3 is unstable.

[0023] like Figure 2 and Figure 3 As shown, in order to improve the stability of one end of the high locking rod 7 inserted in the locking groove 12, the limiting support rod 11 is vertically welded to one end of the locking rod 7, and the limiting support rod 11 slides through the side wall of the limiting slide groove 8 and is fixed by a gasket 9 and a locking nut 10. The limiting slide groove 8 is arranged in a rectangular slide groove, and the width of the limiting slide groove 8 is greater than the diameter of the limiting support rod 11, so that the end of the locking rod 7 inserted into the locking groove 12 can be locked, which is convenient for improving the stability of one end of the locking rod 7 inserted in the locking groove 12.

[0024] The working principle and use process of the utility model are as follows: when in use, the weighted pendulum blocks 6 are provided on both sides of the crank 2, and the weighted pendulum blocks 6 are vertically welded to the outer wall of the crank 2. The weighted pendulum blocks 6 are rectangular blocks, so that the counterweights on both sides of the crank are increased, which is beneficial to improving the stability of the crank swing when working; and a locking rod 7 is inserted through the sliding inside the lower end of the weighted pendulum block 6, and one end of the main shaft neck 1 and the center shaft neck 5 is provided with a locking groove 12 that cooperates with the insertion of the locking rod 7, so that the main shaft neck 1 and the center shaft neck 5 installed inside one end of the connecting seat 3 can be longitudinally inserted and positioned, which is beneficial to improving the stability of the installation and fixation of the main shaft neck 1 and the center shaft neck 5 and the connecting seat 3, and is convenient to reduce the generation of vibration when the connection structure of the shaft neck and the connecting seat 3 is unstable, and the locking rod 7 is convenient and quick to disassemble.

[0025] Finally, it should be noted that the above description is only a preferred embodiment of the utility model and is not intended to limit the utility model. Although the utility model is described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions recorded in the above embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A twin-cylinder engine crankshaft with low vibration, comprising a main journal (1) and a crank (2), characterized in that: The middle part of one end of the crank (2) is connected and fixed via a connecting rod journal (4); a main journal (1) and a center journal (5) are inserted through a connecting seat (3) at the outer sides of both ends of the crank (2); a weighted pendulum block (6) is provided on both sides of the crank (2); a locking rod (7) is slidably inserted inside the lower end of the weighted pendulum block (6); and a locking groove (12) is provided at one end of the main journal (1) and the center journal (5) to be inserted and matched with the locking rod (7).

2. A twin-cylinder engine crankshaft with low vibration according to claim 1, characterized in that: The weight-added pendulum block (6) is vertically welded to the outer wall of the crank (2), and a through hole (13) is provided on the inner side of the weight-added pendulum block (6).

3. A twin-cylinder engine crankshaft with low vibration according to claim 2, characterized in that: The weight-added pendulum block (6) is a rectangular block, and the longitudinal cross-section of the side wall of the weight-added pendulum block (6) can be an isosceles trapezoid.

4. A twin-cylinder engine crankshaft with low vibration according to claim 1, characterized in that: A limiting slide groove (8) is provided inside the lower side of the weight-increasing pendulum block (6), and one end of the locking rod (7) is slidably arranged with the limiting slide groove (8) via a limiting support rod (11).

5. A twin-cylinder engine crankshaft with low vibration according to claim 4, characterized in that: The limiting support rod (11) is vertically welded to one end of the locking rod (7), and the limiting support rod (11) slides through the side wall of the limiting sliding groove (8) and is fixed by a gasket (9) and a locking nut (10).

6. A twin-cylinder engine crankshaft with low vibration according to claim 5, characterized in that: The limiting slide groove (8) is arranged in the rectangular slide groove, and the width of the limiting slide groove (8) is greater than the diameter of the limiting support rod (11).

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